1.What structures are they designed to practise?
1a. modal verbs.
1b. prepositions of place.
2. I think i can make these two as communicative as possible, for (1a) i would ask students to write down their own problems on a piece of paper then the papers would be shuffled and students would be sitting in groups and each group is given a couple of those problems which they are supposed to find solutions for.
For (1b) i would take my students outside and ask them to write sentences on all the places of objects there then i would bring them back inside the classroom and put them in pairs to correct their mistakes with their classmates.